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AQ252 Universal Injection/Mixing Boiler Reset Control Panels
3. Turn up the setpoint of one of the thermostats associated
with the Boiler (Primary) loop.
a. The zone valve or pump associated with that zone
turns on.
b. The Boiler T-T relay activates (Boiler displays in the
demands section of the LCD screen), and the Boiler
pump relay activates (PRIMary displays in the
outputs section of the LCD screen).
NOTE: See Fig. 22 on page 17 for the demands and outputs
display areas on the LCD.
c. Depending on the settings for the AUX.PUMP (line
voltage rated dry contacts) and the AUX OUT (low
voltage rated dry contacts), either or both of these
relays may also close.
4. Turn down the setpoint of one thermostat. The zone
valve or pump associated with that zone should turn off.
The Boiler T-T and Boiler pump relay outputs should de-
activate.
5. Repeat steps 3 and 4 for all zones associated with the
Boiler (Primary) loop to verify that each zone is operating
correctly. Thermostats may be tested individually or all
together to accelerate the check out process.
6. Turn up the DHW Aquastat to simulate a call for hot
water.
a. If the DHW device is a pump, the DHW relay output
energizes immediately. The Boiler pump relay
remains off.
b. If the DHW device is a valve, the Boiler pump relay
energizes after a delay to allow the zone valve to
fully open. This delay is selected from the
EQUIPMENT SETUP>DHW>DHW VLV.OP menu
option.
c. Turn up the setpoint of one of the AQ1000 zone
thermostats.
(1) If the DHW relay is configured to control a pump,
and DHW PRIOrity is selected, the Boiler and the
associated zone pump's relay remain off.
(2) If the DHW relay is configured to control a valve,
and DHW PRIOrity is selected, the Boiler pump
activates after a delay for the DHW zone valve to
open, but the associated zone relays remain off.
(3) If DHW PRIOrity is disabled, space heating zone
pumps and valves should operate during a call for
DHW.
7. Turn down the DHW Aquastat to end the call for hot
water. Space heating operation should continue (if DHW
priority is disabled) or resume (if DHW PRIOrity is
enabled).
8. Repeat the preceding steps for all zones associated with
the Secondary (Mixed temperature) loop. The only
difference between operation of the Primary zones and
the Secondary zones is that the Secondary pump and
the Mixing Device (Injection Pump or Motorized Mixing
Valve) energize on a call for heat from a Secondary zone
but not from a Primary zone.
6 PURGE AIR FROM ALL SYSTEM
AND ZONE PIPING
The PURGE operation on the AQ252 Control Panel allows the
installer to purge all zones (loops) sequentially, or each zone
individually, for a period of time, PURGE TIME, which selected
from the EQUIPMENT SETUP>TEST AND PURGE>PURGE
sub-menu. The purge time can be adjusted in increments of 1
minute, up to a maximum of 30 minutes per loop to be purged.
69-1986—02
After you have defined which loops to purge (all loops, or an
individual loop) and for how long (using the AQ252's menus),
position the indicator arrow
option and press the OK button. The START PURGE display
will change to STOP PURGE and the AQ252 display begins
counting down the time remaining for the purge cycle.
Purging All Loops
When the purge time has elapsed for the first loop, the control
proceeds to the next loop and performs the purge operation on
each loop in sequential order. After all selected loops have
been purged, the display shows PURGE COMPLETED.
7 DOCUMENT AND KEEP A RECORD
OF ALL SYSTEM SETTINGS
After the AQ252 Series Control Panel and any AQ255/AQ257
Expansion Zoning Panels have been set up and the entire
hydronic installation is operating properly, it is important to
document all the system settings for future reference.
Job Records
All AQ2000 Series Panels are shipped with Installation Job
Records for documenting these settings. These should be filled
out completely and saved in the Installing Contractor's files.
NOTES: There are two classes of settings used by the AQ252
to control the operation of the heating system, Zone
Settings and System (or Equipment) Settings. Both
types of settings are stored in non-volatile memory
and are not lost following an extended power
disruption.
WHEN USING AQ1000 THERMOSTATS
1.
Zone Settings are designed to be adjustable by the
user or the installer and are stored in the faceplate
of each zone's AQ1000 thermostat. These settings
are not saved with the SAVE SETUP operation. If
the faceplates of two AQ1000 thermostats are
switched, the settings (setpoints, zone minimum,
zone maximum, etc.) will also be switched.
2.
System Settings are designed to be adjustable
only by the system installer and are stored in the
AQ151 Control Module. These are the settings
that are saved with the SAVE SETUP operation.
SAVE Feature
In addition to the hardcopy Installation Job Records, the
AQ252 Control Panel has a convenient SAVE feature that
allows the installing contractor to save the specific equipment
setting for this installation in the AQ252's memory for future
recall, in case the system's settings are inadvertently changed.
This feature is found in the EQUIPMENT SETUP >
SAVE/RESTORE sub-menu.
There are three levels of settings in the AQ252's memory –
CURRENT, FACTORY and SETUP.
• CURRENT settings are the settings that are currently
displayed in any of the menus and are the settings that the
AQ252 uses to operate. Any time a value is changed in any
of the menus, the CURRENT settings are changed and
these new settings are instantly used by the AQ252 Control
Panel.
20
beside the START PURGE
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